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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9fa61039fb00f37ec967c8faea7c729b069aedfe50e4312cb1af713207ba4fd' 
  AND token = '9mjm1hWdu1oCSKF4X+fKvSRmWHvIJ62QVJJvlkI2EQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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