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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60dbaefe7c55b63d6dc9c0193472835ba13a7d7934a1c7c84446124bcdd4fd2' 
  AND token = 'aJM4iToaFR4ZBSeOi8kk/yKE6sOT+jvSoc30eI2aXJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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