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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6f279eef7225c8a5ac9fd9a7703163b69412cd1c783598101c1e0388252a6c' 
  AND token = 'GonTxrs8477RBpAHxDc6BNRYWavgorx38M6FlF0ches=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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