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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671a330f9caaec75a740d2086b245f6fd8c3d2ea3dd909f8d01d63f291ede809' 
  AND token = 'kOvfVCsRnv5LvWOB0/LJodmx32U11HiUBjGkuN1Lszo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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