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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8317a0a77fb1d543c1e8f5a88cd704bf29ae47130ae38cf4b5410426d9ee9d7' 
  AND token = '2rXLBoIjfGiWC37ZS54sfpxkE61UcI/hqzf+p/EX8IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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