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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8597aca3e3e1a70d4a8b4f22348936634793723e4d588b954017ec3912d83153' 
  AND token = 'pXC8FM6bBfNJVHkOkqUn/pS45OdfK3eIFGr/RJEpmiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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