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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ac31c1fc060e32c38250d1ba2dcf5e3160f4ec0aac081ddda641bd635f9cc76' 
  AND token = 'uEYSHCcnoStEfTBPQHOgI3zyUhadDcDofUfVCwyoF1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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