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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6890fd1f935c5a5877b62359acc53312eaf4039f9e0f66a3d6e1f086210116fb' 
  AND token = 'tw8hgfAtErxggkJ+Tk4EFHjDUnxtNycXZbMuc7AYbz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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