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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30f9a5838b3f5cd701adda676edce09244848ac2cfa029624d5d93c0bce3224' 
  AND token = 'ubPAzQGeXSyzIOcbiC1bDVrGSBAI9Ar6FVCNLDqCO4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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