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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54965f70a15d878483b7a148e33db763d3389b59bb75ec5031bb8203d0bf31cc' 
  AND token = 'D1bN65GQEwSUbGdBj9cA6y5owobvHbtz1xdWWC8KFqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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