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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5a386adc573029aed188e5592f16ac9515fd5a3e0734e3f7df2b57214562b5' 
  AND token = 'NjtjOzaF6736JVZpBSoSRPMr6U+794F/wdrpYE6pUZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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