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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24ef2dea50901aa0055fcb6179976a0356cd285f0536ed0b1377febde8e02f7' 
  AND token = 'WcehahzCtgq32ln36VKNF33JF8AG4rT+HyA+Yz6QWx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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