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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ac877001805d05c5950ca2b1e2fd14ea636a4f0d4931d947aa1edb044f69f5' 
  AND token = 'uEIJnZH2TzHJJHvXtZ1HTDFSAtZwryiJpcwtzQXORZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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