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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37868ebd417532d4281bc5c64b44450de95ecff9439b06e82877876ed8b61588' 
  AND token = 'Kx4NHp/Rc7sXkj0Z4jZI0H4VUyWPwnrRhZovKJkMRbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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