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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9dbe6c742ddead74085675cd5bf40f23732c6bf56c9c316b1bff654831dbc0' 
  AND token = 'fp3pmbi78dI+XP/By9aM8h3FCR2UpIw70sYQJJkuIfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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