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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea8f3772fd10f859a8869468dd8416d71a6a2f4584f5bc179a0681032b6dc49e' 
  AND token = 'x/S7H5Jx62FgGLq+OIIw6PVi9Vquz0ibEFzm4460+G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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