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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc4a0dd139847b20417db57c91a893d83c7623f42e6667d5caeb3c2d9b345c36' 
  AND token = 'oU6PwyeOGbUnZiJm651LyBA656k7HEw79FHN1BBOezE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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