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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bbbf91cc644c2f15c9070e6e32f5631c4292ac3b3f5299fbd4fa2fa07ca5e2d' 
  AND token = 'wS9WepT8+4Tv83QywpJ3vIpb/2kbq7Dpa+YB47+xxFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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