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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35276cacaf269c87fdd35486225db9835ab977450a30fc96a6a3eea74abb859e' 
  AND token = 'J/IagDI971xow7FBbjA7RJ1+mGlbAFgVYxkNXo5MISE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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