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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c4d18ea3977868c49fade42fefeafc1725d2ae7888cdcf7e29b1ea0920af4d' 
  AND token = 'Mhu7RYimYUGvzXjEz5qh655CMD12YuU1iMkmSICAUk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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