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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f679781e282dc4270e6fbd85e7ea318bdf51048e7029607ea888d7a8819562c' 
  AND token = 'VXgrcKyawVohfFFDBCWVQRk/t7Y01np5A3ukgRlx7NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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