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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec7e710ae8856801d7a7689e2f860673117fe42614d0212468cc9851f52a13a' 
  AND token = 'mMIZ+/kwKdfqf2Kmrohkpz/AciT7SVwVB456hOWaM38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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