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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1731c39261026218d7ac003bf5552f4b3228ee927e6ee88bfb50f90fae85831d' 
  AND token = 'xHOoQArL2Wh983m/bu1ekdZGefjqhh5eQz21i9GPPb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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