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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6958248c05000e77b8c94744428ce607986de6e3315a277b19bfee7690677ee6' 
  AND token = 'toOsbeTa4eGWWNJ1oeRRBxkAWGUJwbfJna+ckIkuhQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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