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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07448ad6bf39d66525274ee6b22bfa5af7a56dc0594bef41ddea37e139a0a253' 
  AND token = '75tJhOX4th0NfeaMLIre7MAbJlPbz6NsE9QO5ema0Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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