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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31051ab4b0b1a3a8b03b631f2ae590f53a7da2e49a8f946cefb31c91b27b0dec' 
  AND token = 'lTqSdypNw/H80FTjfjz0Flew2LQITT/L0aALAUrremk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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