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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b49abb2b830b041a5b437465d544850f66a142b93a22cbbc0e3e3b2cb6565fee' 
  AND token = 'qZq5yb8A9O13gfATwpirLgapnkhx4S+dC3i7c77GAT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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