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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a1bd7e2bc2536a08a9c3a4e29ff4e6e2b780b58b9a5e5c320c7dd1d26c531a' 
  AND token = 'hEJh8CVsXxJj2KdkOL8IxBVNiXYAKHUBoBfS2/Ym8h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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