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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5ef3c8553e43251d6540fc90cbc66d40fb8357ffe24ba1dd1a8009538c2aa5' 
  AND token = '1/NWPE2VxtL3QtYuxu9COYM1/ErVLXgxyJJHx5jqEuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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