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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3f227311dad15e7a72bd3d6e5106bb4802abc856d6159f65d5a6d3f7b212a0' 
  AND token = 'F2hhmGTdNFYwSXGwCSfBA5Js4DauMcoAl8B8AZ8lLjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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