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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7986e030a3d30f635296ba6c342108812c99e426d18b37314edc4d767947307' 
  AND token = 'e2mmyvjLbdYRk6h7AoTkMl3bTVyd445gmvwibQSy6yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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