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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2ae0e7779f854f52a5309e291af0b22f16f0ac1d3ae9e27b6e5cf4c45871d8' 
  AND token = 'l+cZz/F6xeA0QXWu1L6myMl5JX0X7OxJv59tF8KxhN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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