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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '328411ffca50b8465f7f8f6742e65326b7c78d334f727ad07c13d7f5a9137ea9' 
  AND token = 'lSP+iOigX7qi3pjePn5kVnP4bFfKftgdeFFNNlh9cog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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