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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77006e9b4b3d0a0e77a240737886ba49327f0ce3beb16e31277b35ce8264686e' 
  AND token = 'jxQz2vr4st48jiOjIVjcfSeXwB8EmUEp32UfUFBNRlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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