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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1736db1d883ee0d5c0a646b55b119bd3b27039aca6987cc63c15b171c0b72c15' 
  AND token = 'B9SeegOCpMf0+dKZFmvyVkjbunH02veztsxcZLbfxRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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