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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d8f133e353cf1b1d70783e312d413bb0134865f5de7e3f4274a4be319a3e9eb' 
  AND token = 'W8aBltS5k3fFmM6q585NeIIqP/KLYVnaG7kFN0tZzu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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