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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccf8c951aa333481b797ccf439d3be89a4c0797a99af89d134eaebd25df5c81' 
  AND token = 'mSjET3/GMO+wtWEQN0X4Okr/OaTnz0xxBsQqqH2ilkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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