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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58332f6d372afda3b1831b7a5a511ba67ae93fc9d990957a7ba2720b2a278e91' 
  AND token = 'LmbtzX7AQzu2Sggiqp4RZHIvJj9bgtLv2V2HvJI6HQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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