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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa52e31579e9a62506981e82fe06daaf37ab86c137e033668ed7ee34fc3c82c1' 
  AND token = 'OwPacRh+q2SAquZc2f/KIak070hn6BTsQpIqSYZAaRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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