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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3607dd3a2418bdb0757f742625ca1c0b196bdf83312419c6ad6dc7c158d84838' 
  AND token = 'tjg2udrHoOKVthmV+DQf2d7b0cRggNZAoZWtkqO94Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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