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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69051404085cac66d85fd58b1a816d5f093c7261ef2584f6f3beb5313d4ec191' 
  AND token = 'L8JL5+PTE65qfNQaQf1L6sxCwSvWsdQ7EAc0ETSKenI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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