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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f0367109c9c87e925b147410148e6e8dc1309e3e0b28a3acf88c06b1d4d256e' 
  AND token = 'd8E4A95gMee0htjPLzRahfJYhDfL6S7tlghy/JbKObQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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