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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01181bd967bc158204af676e8336a06c14100218f4789bf645efccb9715b08e' 
  AND token = 'M0bEuJNJN4+ggCtzksa8qp/if2BLBfvlyja+aYHEC/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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