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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '680f62d27f2a0caa10cac3ef852e2a2cee715eb4266a7a82993839addcb40eb7' 
  AND token = 'NF1U0Nw83xuL8nM7Bp/+nzUlE6XQ0cZxnL7KvV802tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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