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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675528966fb727f9368944a54b66904e6e955273ee99751fa6a29e4ff75f4d83' 
  AND token = 'Q52QfBOTTBse8bt4V/UnC96FjWmriGB0ETGaN+87Mkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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