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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af683cdcf7f6f1578e51a7bdf062bd159182d8022c3baa25ac88784e555f3e5' 
  AND token = 'oShLTDw3qY7HjvYl2ys3dW61p3cj3h8d5mUSrGqvMfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}