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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da26c4cf3b43daf5370003c0ec6b40acd294445f274cacbb64f70a6b3386a393' 
  AND token = 'vGcufX01H9nj57lEggQ+VZCdLDL++rk3zfsTEObl+6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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