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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed402d71bacefa913bc2aa505087fddbb859a0acb768c531b9b7dd645314817c' 
  AND token = 'B8Bjy9S/nqW78YqINy3QE+dNONKJnq0Yjuv6k+XvW8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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