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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2c6a5f86ba383395f672470d3ccb5f36848898f8761cb05d18b890d3c78f57' 
  AND token = '0d+kTY8QQEUWIzRviIRFG/d5N1nGq9pM2Z1xNW6cdlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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