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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc5286a2c1a3b3f609398a20ec464b66710c3f54d73850edea47ab54470092e' 
  AND token = 'jXT7A6JvfXeE4ogZzNiTbECHszC+8IK0AyTVmZcJ2MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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