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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2aafc2a9151ad4d7a3978d99fc11d6c9bf01ac6c939d558b98c12f0d0b4e3d2' 
  AND token = '8b+rejb+cx+PsQfC/6ZTM9kkUprjfnz5izFmUxrWq0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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