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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2989daab8565bc1f3589919ffa9c01dfa1a352dccd2d71e4bd52c022d9e1d44' 
  AND token = 'lLUeR5c9Pviqsx7ZRql4wHgis1fUIAylMiZGJz97E+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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