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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75176967a2e862a4bf5f488a9c04bd9a6efd17e7f54294428d7f9b43fd3d0fed' 
  AND token = 'UoWtiAWCsXSwYqMnPiSgkiDEkiHRiHDuv4rc5iug2t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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