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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b437327d5aa28d49a15680d068a04855b686e3952e60a067d58a86e3bdf6d5' 
  AND token = '5dA7QKaI2EnrlG+An+MJS/BecGP4jVhmplkCY8vi+0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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